一、前言混凝土坝岩基的渗流控制,主要采用两项措施:一是做灌浆帷幕,封堵渗漏通道;二是在幕后打排水孔,将透过和绕过帷幕的渗流安全地排走。此种“堵排结合”的方法,在我国已逐渐形成为一种固定的模式,常被认为是缺一不可。可是,近年来有越来越多的观测资料表 I. INTRODUCTION The seepage control of rockfill dam foundation mainly adopts two measures: one is to make the grouting curtain and block the seepage channel; the other is to play the drainage hole behind the curtain and safely drain the seepage through and around the curtain . This kind of “blocking and discharging combination” approach has gradually become a fixed pattern in our country and is often regarded as indispensable. However, there is an increasing number of observations in recent years